Demodulation circuit, IC, and communication device

Details Demodulation circuit, IC, and communication device Demodulation circuit, IC, and communication device

2007-07-03

2010-02-23

Singh, Dalzid (Department: 2613)

Optical communications

Receiver

C398S208000

Reexamination Certificate

active

07668467

ABSTRACT:
The demodulation circuit of the present invention is a demodulation circuit, connected with a plurality of light-receiving sections each for receiving an optical signal and converting the signal into a binary pulse signal, operable to select and demodulate a pulse signal out of pulse signals that are supplied from the light-receiving sections, respectively, the demodulation circuit including: a judgment and selection section for detecting timing with which High level and Low level of each of the pulse signals are switched and for selecting at least one pulse signal based on the timing; and a demodulation section for demodulating the pulse signal selected by the judgment and selection section. Consequently, the demodulation circuit easily selects and demodulates a signal whose jitter component is small out of a plurality of supplied signals.

REFERENCES:
patent: 5187357 (1993-02-01), Watanabe
patent: 6154487 (2000-11-01), Murai et al.
patent: 6297802 (2001-10-01), Fujioka
patent: 6850709 (2005-02-01), Gfeller et al.
patent: 5-11150 (1993-01-01), None
patent: 10-98435 (1998-04-01), None
patent: 2002-535873 (2002-10-01), None
“Infrared Data Asscociation Serial Infrared Physical Layer Specification”, Version 1.4, (IrDA Serial Infrared Physical Layer Specification, Version 1.4, Feb. 6, 2001).

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